1.4 The Open-Source Directories

We're now getting into the directories which aren't
“major.” Starting with:

dbug
pstack
regex
strings
zlib

Now it's time to reveal a startling fact, which is we didn't write
all of the source code in all of the source code directories all
by ourselves. This list is, in a sense, a tribute to the idea of
open source.

There's dbug, which is Fred Fish's debug library.

There's pstack, which displays the process stack.

There's regex, which is what we use for our regular expressions
function.

There's strings, the meaning of which is obvious.

There's zlib, which is for Lempel-Ziv compression.

All of the programs in these directories were supplied by others,
as open source code. We didn't just take them, of course. MySQL
has checked and changed what's in these directories. But we
acknowledge with thanks that they're the products of other
projects, and other people's labor, and we only regret that we
won't have time to note all the contributed or publicly available
components of MySQL, in this manual.